| 引用本文: | 曾雪洋,刘天琪,王顺亮,喻悦箫,江琴,陈相.换相失败下柔性直流与传统直流互联输电系统的暂态无功协调控制策略[J].电力自动化设备,2019,39(12): |
| ZENG Xueyang,LIU Tianqi,WANG Shunliang,YU Yuexiao,JIANG Qin,CHEN Xiang.Coordinated transient reactive power control strategy for transmission system connected by VSC-HVDC and LCC-HVDC under commutation failure[J].Electric Power Automation Equipment,2019,39(12): |
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| 摘要: |
| 为了抑制柔性直流与传统直流互联输电系统中传统直流换相失败导致的送端电网暂态低电压和过电压，充分发挥柔性直流为传统直流提供无功支撑的能力，提出一种基于触发角的暂态无功协调控制策略。传统直流换相失败时触发角与送端暂态电压关系密切，基于此，将暂态过程中根据触发角得出的无功补偿值附加到柔性直流逆变器外环无功环节中，调整柔性直流逆变器发出的无功功率，改善送端电网电压的暂态特性。对比分析所提控制策略与柔性直流定交流电压控制的控制性能。在PSCAD/EMTDC中搭建互联输电系统的仿真模型，结果验证了所提控制策略的适应性，且该控制策略的控制效果优于柔性直流定交流电压控制。 |
| 关键词: 互联输电系统 换相失败 暂态过电压 无功协调控制 触发角 |
| DOI：10.16081/j.epae.201911015 |
| 分类号:TM721.1 |
| 基金项目:国家自然科学基金资助项目(51977135) |
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| Coordinated transient reactive power control strategy for transmission system connected by VSC-HVDC and LCC-HVDC under commutation failure |
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ZENG Xueyang, LIU Tianqi, WANG Shunliang, YU Yuexiao, JIANG Qin, CHEN Xiang
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College of Electrical Engineering, Sichuan University, Chengdu 610065, China
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| Abstract: |
| In order to inhibit the transient low voltage and overvoltage of sending-end power system caused by commutation failure of LCC-HVDC(Line Commutated Converter based High Voltage Direct Current) in the transmission system connected by VSC-HVDC(Voltage Source Converter based High Voltage Direct Current) and LCC-HVDC, and take full advantage of reactive power supporting ability of VSC-HVDC to LCC-HVDC, a coordinated transient reactive power control strategy based on trigger angle is proposed. The relationship between the trigger angle and the transient voltage of sending-end power system is close when commutation failure of LCC-HVDC happens, on this basis, the reactive power compensation value obtained by the trigger angle in the transient process is added to the reactive power link in the outer loop of VSC-HVDC inverter, which adjusts the reactive power generated by VSC-HVDC inverter and improves the voltage transient characteristics of sending-end power system. The control performances of the proposed control strategy and VSC-HVDC constant AC voltage control are compared and analyzed. The simulation model of an interconnected transmission system is built in PSCAD/EMTDC, and results verify the adaptability of the proposed control strategy, and its control effect is better than that of VSC-HVDC constant AC voltage control. |
| Key words: interconnected transmission system commutation failure transient overvoltage coordinated reactive power control trigger angle |
